;
; Program 1, Hello  World
; This program prints Hello World!
;
section .data
     message: db "Hello World!", 0x0A
     message_length: equ $ - message

     SYSCALL_WRITE: equ 1
     STDOUT: equ 1
     SYSCALL_EXIT: equ  60
     SUCCESS: equ 0

section .text
   global _start

_start:

    ; cout << message << endl;
    mov rsi, message
    mov rdx, message_length

    ; set the output file to be stdout
    ; mov rdi, 1
    mov rdi, STDOUT

    ; set the system call to be write
    mov rax, SYSCALL_WRITE
    ; mov rax, 1
    syscall

    ; return 0;

    ;  set the system call to be exit
    ; mov rax, 60
    mov rax, SYSCALL_EXIT 

    ; set the success code to be 0
    ; mov rdx, 0
    mov rdx, SUCCESS
    syscall